Website Speed Test

Test your website's TTFB (Time to First Byte) and total response time instantly. Get a performance grade A–F and actionable tips to speed up your site.

What does this tool measure?

TTFB (Time to First Byte)

How long your server takes to start responding. This is a Core Web Vitals metric and a direct ranking signal for Google Search.

Total Response Time

The full time to download the complete response body — useful for understanding bandwidth and content size impact.

Compression & Caching

Checks whether gzip/Brotli compression is enabled and whether a CDN is serving cached content at the edge.

Performance Grade

Gives your site a grade from A (excellent, TTFB <200ms) to F (very slow, TTFB >1500ms) with specific improvement tips.

Performance Grading Scale

Grade A — Excellent

TTFB under 200ms. Your server responds very quickly. No action needed.

Grade B — Good

TTFB 200–500ms. Good performance. Consider a CDN for further improvement.

Grade C — Needs Work

TTFB 500–800ms. Noticeable to users. Review server-side caching and CDN setup.

Grade D/F — Slow

TTFB over 800ms. This will hurt SEO and user experience. Investigate server performance immediately.

Got questions?

Frequently asked questions

Everything you need to know about Uptrue — no fluff.

What is TTFB (Time to First Byte)?
TTFB (Time to First Byte) is the time between a browser sending an HTTP request and receiving the first byte of the response. It measures server responsiveness and is a key factor in both user experience and Core Web Vitals. A good TTFB is under 200ms.
Google recommends a TTFB under 200ms (grade A). Under 500ms is acceptable (grade B). Over 800ms starts to negatively affect user experience and SEO rankings. For e-commerce sites, even a 100ms improvement in response time can measurably increase conversions.
Key steps to speed up your website: (1) Use a CDN like Cloudflare to serve content from edge locations close to your users. (2) Enable gzip or Brotli compression to reduce transfer size. (3) Optimise database queries and use caching (Redis, Memcached). (4) Use a faster hosting provider or upgrade your server. (5) Minify HTML, CSS, and JavaScript. (6) Optimise and lazy-load images.
Common causes of slow TTFB include: slow server-side processing (complex database queries, inefficient code), no server-side caching, shared hosting with resource contention, no CDN (serving content from a distant server), network latency, and slow DNS resolution.
Yes. Google has used page speed as a ranking factor since 2010, and Core Web Vitals (which include TTFB-related metrics) became a ranking signal in 2021. Faster sites also have lower bounce rates, higher engagement, and better conversion rates — all of which indirectly benefit SEO.

Monitor response time 24/7

Uptrue's response time threshold monitoring checks every minute and alerts you the moment latency drifts past your threshold. Pair it with page size monitoring to catch deploys that silently bloat the site — both contribute to slow page loads.

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